oh, now you are jack kennedy? >>. >> reporter: and the vice president was also responded to by paul ryan. >> i know that you are under duress to get your points across. >> but as the vice president knows words don't always come out of your mouth the right way. >> and i was embarrassed for the vice president, because there were 82 times that joe biden interrupted paul ryan. >> reporter: but also on substance. declaring victory for the running mate, romney seized on what his campaign has been called the biden's benghazi bungle. >> because the vice president directly contradicted the sworn testimony of state department officials. he's doubling down on denial. and we need to understand exactly what happened. >> reporter: but back in the spin room, the obama campaign manager jim massena said it was ryan who was unprepared. >> he got past paul ryan's index talking points and into the details, and that is what the american voters wanted. >> reporter: and ryan will campaign in battleground state of ohio and the other half